<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,
    initial-scale=1.0">
    <title>学习HTML</title>
</head>
<body>
<!--字体变粗-->
<strong>我是一个Strong标签，字体变粗了</strong>
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</body>
</html>